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Financial instruments - Gains and losses (Details) - ARS ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Financial instruments. |  |
Net gain (loss) on financial assets at amortised cost | $ 2,211 | $ 707
Net gain (loss) on financial liabilities at amortised cost | (3,213) | (3,010)
Net gain (loss) on financial assets at fair value through profit or loss | 904 | 305
Net gain (loss) on financial liabilities at fair value through profit or loss | 3 | (1)
Total gain (loss) on financial instruments | (95) | (1,999)
Interest on financial assets at amortised cost | 947 | 374
Interest on financial liabilities at amortised cost | (940) | (1,667)
Total interest income (expense) on financial instruments | 7 | (1,293)
Other short-term investments |  |
Financial instruments. |  |
Net gain (loss) on financial assets at fair value through profit or loss | 121 | 61
NDF |  |
Financial instruments. |  |
Net gain (loss) on financial assets at fair value through profit or loss |  | 6
Tuve's Paraguay S.A shares purchase option |  |
Financial instruments. |  |
Net gain (loss) on financial assets at fair value through profit or loss |  | 11
Government bonds |  |
Financial instruments. |  |
Net gain (loss) on financial assets at fair value through profit or loss | $ 783 | $ 227

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